Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports
Bogdan Cojocaru, Tefan Neau, Vasile I. Pârvulescu, Karifala Dumbuya, Hans Peter Steinrück, J. Michael Gottfried, Carmela Aprile, Hermenegildo Garcia, J. C. Scaiano
Unite de recherche en chimie des nanomateriaux
Different metallophthalocyanines and 2,4,6-triphenylpyrylium (TP +) ions were entrapped in different inorganic supports such as Y zeolite, mesoporous MCM-41, TiO2-SiO2 and SiO2 following a specific protocol. The resulting supramolecular structures were characterized by chemical analysis and diffuse reflectance UV-Vis measurements. The determination of the band gap on the basis of UV-Vis measurements showed that the host is not a spectator in this process and an electronic interaction occurs that lowers the band gap of the support. The XPS measurements were performed with an in situ X-ray photoelectron spectrometer, which can be operated at pressures of up to 1 mbar at the sample. They indicated that the formation of the supramolecular structure generates a stable environment, in which the oxidation state of the metal can still be influenced by reaction of the metal center with gas molecules. The photocatalytic tests carried out in photodecomposition of dipropyl sulfide showed a good correlation between the band gap values and the photocatalytic activity for metallophthalocyanine complexes. It is remarkable that the triphenylpyrylium ion follows the same trend observed for metallophthalocyanines, although it is a different type of photosensitizer.
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https://doi.org/10.1039/b902348h
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10.1039/b902348h
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Supramolecular Structure composés chimiques 100%
Metallophthalocyanines composés chimiques 89%
Photocatalytic Activity composés chimiques 73%
Band Gap composés chimiques 70%
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UV/VIS Spectroscopy composés chimiques 39%
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Cojocaru, B., Neau, T., Pârvulescu, V. I., Dumbuya, K., Steinrück, H. P., Michael Gottfried, J., Aprile, C., Garcia, H., & Scaiano, J. C. (2009). Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports. Physical Chemistry Chemical Physics, 11(27), 5569-5577. https://doi.org/10.1039/b902348h
Cojocaru, Bogdan ; Neau, Tefan ; Pârvulescu, Vasile I. ; Dumbuya, Karifala ; Steinrück, Hans Peter ; Michael Gottfried, J. ; Aprile, Carmela ; Garcia, Hermenegildo ; Scaiano, J. C. / Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports. Dans: Physical Chemistry Chemical Physics. 2009 ; Vol 11, Numéro 27. p. 5569-5577.
@article{c6d410fce5604aaf9d39ad6f2f7df702,
title = "Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports",
abstract = "Different metallophthalocyanines and 2,4,6-triphenylpyrylium (TP +) ions were entrapped in different inorganic supports such as Y zeolite, mesoporous MCM-41, TiO2-SiO2 and SiO2 following a specific protocol. The resulting supramolecular structures were characterized by chemical analysis and diffuse reflectance UV-Vis measurements. The determination of the band gap on the basis of UV-Vis measurements showed that the host is not a spectator in this process and an electronic interaction occurs that lowers the band gap of the support. The XPS measurements were performed with an in situ X-ray photoelectron spectrometer, which can be operated at pressures of up to 1 mbar at the sample. They indicated that the formation of the supramolecular structure generates a stable environment, in which the oxidation state of the metal can still be influenced by reaction of the metal center with gas molecules. The photocatalytic tests carried out in photodecomposition of dipropyl sulfide showed a good correlation between the band gap values and the photocatalytic activity for metallophthalocyanine complexes. It is remarkable that the triphenylpyrylium ion follows the same trend observed for metallophthalocyanines, although it is a different type of photosensitizer.",
author = "Bogdan Cojocaru and Tefan Neau and P{\^a}rvulescu, {Vasile I.} and Karifala Dumbuya and Steinr{\"u}ck, {Hans Peter} and {Michael Gottfried}, J. and Carmela Aprile and Hermenegildo Garcia and Scaiano, {J. C.}",
doi = "10.1039/b902348h",
journal = "Physical chemistry chemical physics : PCCP",
Cojocaru, B, Neau, T, Pârvulescu, VI, Dumbuya, K, Steinrück, HP, Michael Gottfried, J, Aprile, C, Garcia, H & Scaiano, JC 2009, 'Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports', Physical Chemistry Chemical Physics, VOL. 11, Numéro 27, p. 5569-5577. https://doi.org/10.1039/b902348h
Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports. / Cojocaru, Bogdan; Neau, Tefan; Pârvulescu, Vasile I.; Dumbuya, Karifala; Steinrück, Hans Peter; Michael Gottfried, J.; Aprile, Carmela; Garcia, Hermenegildo; Scaiano, J. C.
Dans: Physical Chemistry Chemical Physics, Vol 11, Numéro 27, 2009, p. 5569-5577.
T1 - Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports
AU - Cojocaru, Bogdan
AU - Neau, Tefan
AU - Pârvulescu, Vasile I.
AU - Dumbuya, Karifala
AU - Steinrück, Hans Peter
AU - Michael Gottfried, J.
AU - Aprile, Carmela
AU - Garcia, Hermenegildo
AU - Scaiano, J. C.
N2 - Different metallophthalocyanines and 2,4,6-triphenylpyrylium (TP +) ions were entrapped in different inorganic supports such as Y zeolite, mesoporous MCM-41, TiO2-SiO2 and SiO2 following a specific protocol. The resulting supramolecular structures were characterized by chemical analysis and diffuse reflectance UV-Vis measurements. The determination of the band gap on the basis of UV-Vis measurements showed that the host is not a spectator in this process and an electronic interaction occurs that lowers the band gap of the support. The XPS measurements were performed with an in situ X-ray photoelectron spectrometer, which can be operated at pressures of up to 1 mbar at the sample. They indicated that the formation of the supramolecular structure generates a stable environment, in which the oxidation state of the metal can still be influenced by reaction of the metal center with gas molecules. The photocatalytic tests carried out in photodecomposition of dipropyl sulfide showed a good correlation between the band gap values and the photocatalytic activity for metallophthalocyanine complexes. It is remarkable that the triphenylpyrylium ion follows the same trend observed for metallophthalocyanines, although it is a different type of photosensitizer.
AB - Different metallophthalocyanines and 2,4,6-triphenylpyrylium (TP +) ions were entrapped in different inorganic supports such as Y zeolite, mesoporous MCM-41, TiO2-SiO2 and SiO2 following a specific protocol. The resulting supramolecular structures were characterized by chemical analysis and diffuse reflectance UV-Vis measurements. The determination of the band gap on the basis of UV-Vis measurements showed that the host is not a spectator in this process and an electronic interaction occurs that lowers the band gap of the support. The XPS measurements were performed with an in situ X-ray photoelectron spectrometer, which can be operated at pressures of up to 1 mbar at the sample. They indicated that the formation of the supramolecular structure generates a stable environment, in which the oxidation state of the metal can still be influenced by reaction of the metal center with gas molecules. The photocatalytic tests carried out in photodecomposition of dipropyl sulfide showed a good correlation between the band gap values and the photocatalytic activity for metallophthalocyanine complexes. It is remarkable that the triphenylpyrylium ion follows the same trend observed for metallophthalocyanines, although it is a different type of photosensitizer.
U2 - 10.1039/b902348h
DO - 10.1039/b902348h
JO - Physical chemistry chemical physics : PCCP
JF - Physical chemistry chemical physics : PCCP
Cojocaru B, Neau T, Pârvulescu VI, Dumbuya K, Steinrück HP, Michael Gottfried J et al. Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports. Physical Chemistry Chemical Physics. 2009;11(27):5569-5577. https://doi.org/10.1039/b902348h